A 90% confidence interval for the population mean 
is found to be between 5.28 and 6.72. Based on this information, the sample mean 
that generated the confidence interval was 6.
Definitions:
Accommodation
In psychology, the process of adapting one's cognitive structures to incorporate new information, distinct from assimilation.
Cognitive Substitution
The replacement or supplementation of a missing cognitive function through the use of an alternative cognitive strategy or external aid.
Physical Maturation
The process of physical growth and development of the body, reaching full biological adulthood and sexual development.
Social Environment
The immediate physical and social setting in which people live or in which something happens or develops.
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